How to Use a Gamecube Controller on a Wii: 5 Steps (with Pictures)
Wii U's GameCube controller will support more than just Smash Bros. [updated] | VentureBeat
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Just Got One of Those Gamecube Controllers That Plug Into the Wii Remote. What's the Difference Between These and the Actual Gamecube Controllers? : r/smashbros
Switch's 4.0.0 update now allows for GameCube controller support with Wii U GameCube Adapter
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How to Use a Gamecube Controller on a Wii: 5 Steps (with Pictures)
White Wii U GameCube Controller Adapter Spotted - News - Nintendo World Report